Consider the figure shown in Figure E5.33. You are lowering two boxes, one on top of the other, down a ramp by pulling on a rope parallel to the surface of the ramp. Both blocks move with constant velocity of 15.0 [m/s]. The coefficient of kinetic friction between the ramp and the lower box is 0.444 and the coefficient of static friction between the two boxes is 0.800. a. Draw the Free-Body diagram of both blocks. Set the x axis parallel to the ramp. b. Write the x and y components of 2nd law for both blocks considering their state of motion (accelerations). c. What are the magnitude and direction of the frictional force on the upper box?

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.